Sea & Sea YS-90TTL Duo Strobe

The YS-90TTL Duo incorporates the most popular features of Sea & Sea's best selling mid-size and mini strobes. It is similar in design to the YS-60, but like the breakthrough YS-120, it features Sea & Sea's patented dual electronic circuitry, automatically dedicating via four or five-pin connectors with Sea & Sea cameras, Nikonos cameras, and Nikon housed systems. Like the YS-30, it incorporates a slave mode that syncs for TTL operation without the use of a sync cord! It is the world's only mid-sized cordless TTL slave.